Sprocket-wheel.



P. W. SGHANDONEY & W. J. HALL.

.SPROGKET WHEEL.

APPLICATION FILED MAR. 2, 1909.

Patented Jan 18,1910.

2 SHEETS-SHEETZ.

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UNITE FRED W. SCI-IANDONEY AND VJILLIAM J. HALL, OF LIND, IVASHINGTON.

SPROCKET-WHEEL.

Specification of Letters Patent.

Patented Jan. 18, 1910.

Application filed March 2, 1909. Serial No. 480,881.

To all whom it may concern:

Be it known that we, FRED IV. SCHAN- DONEY and TVILLL-Xhi J. IIALL,citizens of the United States, residing at Lind, in the county of Adamsand State of \Vashington, have invented certain new and usefulImprovements in Sprocket-Wheels, of which the fol lowing aspecification.

In a sprocket wheel the only parts subject to wear are the teeth and therim, in view of which it is desirable to make such parts detachable inorder that they may be removed when worn, and replaced by new parts.

The present invention has for its object to provide a sprocket wheel inwhich the rim and teeth are detachable for the purpose stated. novel andimproved means being employed for connecting said parts to the body ofthe wheel, as will be hereinafter described and claimed.

The invention is illustrated in the accompanying drawings in which-Figure 1 is an edge view of the wheel, partly in section. Fig. 2 is aface view, partly broken away. Fig. 8 is a section showing a modifiedform of tooth fastening. Fig. t is a view similar to the precedingshowing another form of tooth fastening. Fig. 5 is a perspective view ofthe form of tooth employed in the structure shown in Figs. 1 and 2. Fig.(3 is a perspective view of the body and rim of the wheel shown in Figs.1 and 2. Fig. 7 is a perspective view of one of the rim sections. Fig. 8is a perspective view of a fragment of a modified form of rim. Figs. 9and 10 are edge views of further modified forms of rims.

Referring to the drawings, 1 denotes the body of the wheel, the samebeing in the shape of a disk, and provided with a hub 2. A keyway 3 ismade in the hub which receives the usual key for fastening the wheel tothe shaft, or other part. In the periphery of the disk, midway betweenthe faces thereof, are inwardly tapering radial sockets 4, which receivethe shanks 5 of the detachable teeth 6, said shanks being also madetapering or wedge shaped, so that they may be driven tightly into thesockets. The sockets are spaced apart uniformly, and they correspond innumber to the number of teeth with which the wheel is provided.

The rim of the wheel shown in Figs. 1, 2 and 6 is composed of aplurality of arcuate strips '7 which are so dimensioned that when fittedto the periphery of the disk 1, they form a ring which completely andsnuglyencircles the same. The strips are of the same width as the disk,and they are of such length that the joints between the strips are overthe sockets 4. The meeting ends of the strips are recessed as indicatedat 8, and the recesses of adjoining strips are in alinement as clearlyshown in Fig. 6. The alined recesses register with the sockets, and theshanks of the teeth pass therethrough.

Instead of making the rim in sections, it may be in one piece as shownin Fig. 9.

The teeth are fastened in the sockets by wedge bolts 9 passingtransversely through openings in the disk and in the shanks of theteeth, said openings registering when the teeth are in place. If desiredsome other form of bolt may be employed.

The rim and the teeth will be made of some metal having a smallercoefficient of friction than cast iron which is usually employed in theconstruction of the wheel body, and also in wheels having integral teethand rims, thus causing less wear on the chain.

By the structure herein described the teeth and the rim are rigidlysecured to the wheel body, and at the same time they can be easilyremoved when worn. The parts are few and simple, and the wheel cantherefore be cheaply manufactured.

The body of the tooth is wider and thicker than the shank, whereby ashoulder 10 is formed at the sides and ends of the tooth base, whichshoulder engages the outer surface of the rim, as shown in Figs. 1 and 2whereby the rim is clamped to the disk, and thus securely fastened inplace. No additional fastening means are necessary, and the structure istherefore greatly simplified, the fastening means of the teeth alsoserving to fasten the rim.

In the modification shown in Fig. 3, the disk 1 has recesses 11 in itsfaces, said recesses being preferably arranged in alternate order, andopening into the periphery of the disk. The rim employed is preferablyin one piece, and has notches 12 in its edges corresponding to therecesses 11 when in place. This form of ring is shown in Fig. 10. Thetooth employed has a shank 13 which fits in the notch and recess, theshank being located to one side of the tooth, whereby a shoulder 14 ishad at the base of the tooth, which shoulder engages the outer surfaceof the rim, and serves the same purpose as the shoulder 10. The tooth isfastened by a wedge bolt in. the same manner as the tooth alreadydescribed.

In the modification shown in Fig. 4:, the shank of the tooth is slotted,the two branches 15 thus formed straddling the disk which is recessed toreceive said branches. As in the structures already described, the rimfits between the base of the tooth and the periphery of the disk, and inthe present instance has notches 16 in its edges through which the shankbranches pass into the recesses of the disk. A. wedge bolt as before isemployed for fastening the tooth in place.

We claim 1. A sprocket wheel having a detachable rim and separate anddetachable teeth.

A sprocket wheel comprising a disk having sockets in its periphery,teeth detachably secured in said sockets, and provided with shoulders,and a detachable rim held between the periphery of the disk and theshoulders of the teeth.

A sprocket wheel comprising a disk havin sockets in its eri )her adetachable rim fitting said periphery, and having openings registeringwith the sockets, teeth provided with shanks extending through theopenings, and into the sockets, and having shoulders engaging the rim,and means for detachably securing the teeth.

A sprocket wheel comprising a disk, a detachable rim fitting theperiphery of the the the and ing openings registering with the sockets,

sprocket teeth having shanks extending through said openings and intothe sockets, and having shoulders engaging the outer surface of the rimsections and means for detaehably fastening the shanks in the sockets.

G. A sprocket wheel comprising a disk having sockets in its periphery, adetachable sectional rim fitting said periphery, the meeting ends of thesections having recesses, and the recesses of adjoining sectionsregistering with the sockets, and teeth provided with shanks extendingthrough said recesses into the sockets, and detachably fastened therein,the teeth having means for clamping the rim sections between said teethand the periphery of the disk.

In testimony whereof we atlix our signatures in presence of twowitnesses.

FRED XV. SCHANDONEY. lVILLIAM J. HALL.

Witnesses D. R. llIORGAN, R. J. GORDON.

